I didn't have any soft drink container cut offs recently when one of my small crabs was moulting, so I had to think of something pretty quickly. The solution was a plastic ice cream cone holder that we had. I just turned it upside down over the crab and pushed it into the sand a bit. Looked a bit daft but it worked really well. The crab dug itself out after about 2 weeks and went on its way.
It kept the moisture and heat in as well as allowing ventilation through the top of the tube part.
Hope I have explained this OK.
PS we got the cone holder at Sea World, but surely they are available in shops??
Try this to isolate small crabs
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Topic author
That's actually quite innovative. Sounds like it would work pretty well. The soft-drink container cutoff/2liter solution is kind of a general idea, really. You can pretty much use anything that's got a hole at the top for ventilation but is too small for other crabs to get in through, and is sturdy enough to be pushed down into place as a shield for the crab.